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An important consideration is that Pixel Planets appears to be designed as a standalone GUI focused tool rather than something to integrate directly into a game. The main use-case of the tool seems to be outputting png, gif, or spritesheet exports for user generated planets. I guess the aim is to allow people to generate planets that they can import into their games, rather than use the generation in a game itself. It's not really designed as a "plug-and-play" module or plugin for games. It would require a fair amount of work to integrate it.
Interestingly, there is another version of this project by the same creator called Pixel Planets API. The API.gd script has some examples and instructions for how to export a planet image on demand using the function _create_planet. It would require some adapting to integrate it with another game or tool, but I think that could be easier than trying to integrate the original. Its output is still an exported file (png, gif, or spritesheet) though.